Electric welding-machine.



= OH V Patented Sept.:25, 1900. 0. PARPART.

ELECTRIC WELDING MACHINE.

(Application filed Jan. 31, 1898.)

(No Model.)

5 Sheets-Sheet l.

w/nmssss No. 658,74l. Patented Sept. 25, I900. 0. PARPART.

ELECTRIC WELDING MACHINE.

(Application filed 3511 331, 1898.) (No Model.) 5 Sheets-Shut 2.

If] w \m E 2 Q i WITNESSES ATTORNEY.

m: m: mans co. walnut)" Manama. ov cv Patented Sept. 25, i900.

5 Sheets-Sheet 3.

I INVENTOH ATTORNEY.

0 PARPART ELECTRIC WELDING MACHINE.

(Apphcntmn filed Jun. 81, 1898) WITNESSES.-

No. 658,74l.

(No Model) m: Nomus rcTERs ca. mom-urns" wnsnmown. a. c.

(No Model.)

Fill

WITNESSES 0. PARPABT.

Patented Sept. 25, I900.

ELECTRIC WELDING MACHINE.

(Application filed Jan. 31, 1898.)

5 Sheets$heet 4.

' /MVEN 70/? ATTORNEY r n V w m 5 0 0 m w M M N W s T H 0 5 N T w 2 m E T n 8 V A M e 4 t .J p S e S 5 m d M e t n :h e A t J a P E w Am w TMM. .M HG a mm m a RWM m f AYEQ w m m 0 m m m m w 7 E J N w M rm 6 .M W 0 M r 0 0 v N N a x I M .i\

UNITED STATES PATENT OFFICE.

, OTTO PARPART, OF CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO THE STANDARD WELDINGCOMPANY, OF SAME PLACE.

ELECTRIC WELDINGMACHINE.

SPECIFICATION 'ama baa of Letters Patent No. 658,741, dated Se tember 25, ieoo.

. Application filed January 31,1898.

To all whom itmay concern Be it'known that I, OTTO PARPART, a citizen of the United States, and a resident of Cleveland, county of Guyahoga, and State of Ohio, have invented a newand useful Improvement in Tube-Welding Machines, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

The objectof my invention is to provide-a machine for electrically welding the buttjoints of tubes; i :5 The nature of the invention consists of the means hereinafter described,and particularly pointed out in the claims.

description set forthin detail certain mechclosed meansconstituting but one of various mechanical forms in which the principle of the invention may be used.

Figure I is an elevation of that endof the machine from which the welded tube is passed out, the finalv set of pressure-rollers being omitted in order to avoid confusion of members. Fig. II is a vertical cross-section of the machine, looking in the direction from which the tube comes in its passage, the joint-guide being omitted to prevent confusion of members. Fig. III is a leftend elevation thereof. Fig. IV is a right end elevation thereof. Fig. V is a horizontal cross-section on line 5 5 of Fig. II. Fig. VI is an enlarged detail view of a central vertical section on line 6 6 of Fig. I, excepting certain members shown in elevation. the conducting-roll stands on line 7 7 of Fig, .II. Figs. VIII and IX are respectively horizontal, sectional, and side elevation views of a pair of compression-rolls for taper-tube I work. Fig. X is alongitudihal central sec- Y tional view of one of the conducting-rolls and 5 its spindle. Fig. XI is a detail view of parts of one conducting-roll and compression-roll.

Fig. XII is a detail vertical sectional view;

i showing the position of the joint-guide rela tively to the conducting-rolls.

supported in a suitable bed-frame 8,1 pen the The'annexed drawings and the following.

anism embodying the" invention, such-dis-.

Fig. VII is a detail section of one of.

An electric transformer A' is inclosed and Serial No. 6 6 8,52 7. .l\| o medeL:

upper face of which slide horizontally two platens C C, Fig. II. Each of such platens is connected with the transformer andis elec trically insulated from the said bed-frame B by insulation-pieces b, Fig. VI, such ,insu'lawhich support and guide said platens from" the bed-frame. platens toward and from each other. Bolted,

Screws 0 serve to move said respectively, upon the platens O and-C are two stand-frames D and D, Figs. I and II.-

In each of said frames is supported a journ albox D Fig. II, which journals a spindle. E,

carrying at its inner extremity a currentcon! p The cap d, Fig. VII, of said r box fits between two lateral flanges 61, formed U,

ducting roll E.

integral with the lower portion d of the box.

The said portion d slides snugly between' with two lateral T- grooves, in which a the lateral faces of a shoe D and is formed adapted to slide the heads of bolts 01, which} extend through the shoe and project on the outside of the stand-frames. A yoke dfis bolted to the top of the shoe D and has attached to it a screw d, by which it may be moved upwardly or downwardly. Two lateral segments D are formed integralwith the sides of the yoke and project into segmental slots D Fig. II, formed in the frame. The centers of the segments respectively lie approximately in the axis of the tubewhichf is being welded, whereby by shifting the position of the segments, and hence the spindles,

the conducting-rolls may be adjusted to accommodate different sizes of tubes, all points f in the saidrolls moving on such adjustment in the arcs of circles whose centers are the axisof the tube. with washers of larger diameter than the The bolts 01 are provided,

width of the slot, whereby the shoes may be free from bearing upon such joint, each of 's'pective spindles. rolls, as well as the two conductingrolls, op-

by said edge portions when the tube is being welded. The vertical plane passing through the axes of the conducting-rolls is before the vertical plane passing through the axes of the compression-rolls F and F, such two planes being parallel with each other and at right angles to the line of the tube movement. Fig. XI isa detailview, on an enlarged scale, showing parts, respectively, of one conducting-roll and one compression -roll, the dotted linear m marking the axial plane of such conducting-roll and the dotted line y y marking the axial plane of the compression 'roll. I prefer to have the axial plane of the cond ucting rolls from one-eighth to one-quarter of an inch before the axial plane of the compression-rolls. While the axial plane of the conducting-rolls across the line of movement of the tube is slightly before the axial plane of the compression-rolls across such line, yet the two sets of rolls are relatively located, so that a plane right angular to said line of movement of the tube may pass through all four rolls.

In operative position the two conductingrolls are in equal degree inclined to a plane determined by the longitudinal tube -joint and the axis of the tube. This inclined position of the current-conducting rolls results 'in a sufficient pressure on the tube to insure- I the perfect contact of the free edges of the .gjoint that is to be welded without bending or findenting the tube at the points of cont-act that is, such force which causes such free edges to approach each other is exerted in a direction as nearly tangential to the curve of the tubes, and hence as nearly parallel with the material at such points of contact as is practicable.

Respectively on the opposite faces of the stand-frames D and D are bolted and electrically insulated from said frame by insulation-pieces g, Fig. II, two bearings fand f, such bearings journaling, respectively, spindles f and f which carry at their upper extremities the compression-rolls F and F. Roll F is driven by a bevel-gear G, secured to drivingshaft G, and meshing with bevelgear G secured to spindle f such spindle having secured to it spur G which latter meshes with spur-gear G secured to spindle Each of said compression-rolls is formed upon its periphery with a concave face adapted to receive and partially inclose a tube. These two com pression-rolls F and F may be of any suitable size to correspond with the difierent sizes of tubing to be welded, they being detachably connected with their re- These two compressionerate to make a definite and material upset on each of the two meeting edge portions of the tube, the construction and adaptation of all parts being such as to insure such upset ting formation to a substantial degree.

Bolted upon the face of the stand-frame D is a frame H, Figs. I, III, IV, and VI, such frame being electrically insulated from said stand-frame by insulation-pieces g. On the opposite side of said stand-frame is bolted and electrically insulated a second frame H, Fig. II. The electric current in its passage between its opposite electric poles must pass entirely and exclusively by way of the two current-conducting rolls, the construction and insulation of all machine parts excluding other ways of passage.

Tlfe two frames Hand H form bearings for two sets of draft-roll spindlesj andj, Fig. -I,

such spindles carrying on their inner extremities the two sets of draft-rolls J and J, Fig. VI, such draft-roll sets being respectively on eachside in the line of the tube-movement of the compression-rolls Fand F. The

said spindles are driven by a train of gears K, which drive the upper draft-rolls in one direction and the lower rolls in the opposite direction, said directions being such as to move the tube forward,such direction of move-v ment being shown as from right to left in Fig. VI. The said draft-roll spindles are journaled in boxes which slide in slots hand whose position, with the exception, as hereinafter shown, of the upper one of the pair of Thus the upper roll may be retracted and the two rolls be quickly stopped or started, as desired.

The distance between the two pairs of draftrolls should be less than the length of the tube, so that during compression one or the other of the sets of draft-rolls engagesthe tube, insuring an unvarying draft upon the tube, as a result of which every point along loo the joint is subjected to the same amount of heat and pressure, thereby making a homogeneous weld throughout the length of such .joint.

On opposite sides of the initial draft-rolls J and in the line of the tube movement are respectively located, suitably secured to the stand H, two tube-joint guides L and L, Fig. VI. Guide L directs the tube, with its joint, in proper position relatively to the draftrolls J. Guide L directs the tube, with its joint in proper position relatively to the conducting-rolls E. Each of these two jointguides is located in a plane passing centrally through the clear space between the two conducting-rolls and is adapted to fit between the two edges of the tube-joint. The correct of draft.

conductingrolls is caused to have contact with only its appropriate one of the two edge portions of the tube, and each of said edge portions is caused to have the proper width of metal between its appropriate conductingroll and the tube-joint, an initial guide, initial draft-rolls, a second guide, currentconducting rolls, compression-rolls, and a final set of draft-rolls beinglocated in relative succession in the direction of the tube move-' ment and performing their respective functions one after the other in order of time.

Pressure-rollers M and M, located, respectively, before and after the set of final draftrolls, are adapted to bear down upon the tube and maintain it in horizontal line at such points.

For welding taper-tubes I employ a special set of compression-rolls N, (shown in Figs. VIII and IX,) the groove 97. of such rolls being of spiral form, gradually decreasing from the greatest to the least diameter of the tube.

In operating the machine the tube is fed into the feed-rolls J, the initial guide L directing it, the said rolls having been previously adjusted to exert the required amount After passing through said rolls the tube directed by the second guide L is received by the conducting-rolls, the latter being adjusted'to compress the tube sufficiently to bring the contiguous free edges of the joint into contact, whereupon the electric current passes across the joint and heats the metal on opposite sides thereof to a welding heat. The tube is then received by the compression -rolls, which completely coinpresses the parts together and finishes the Weld. The tube is thereafter received by the final set of draft-rolls, which effects the proper delivery thereof.

It is apparent from the foregoing that my machine embodies the following: two electric current conducting rolls respectively connected with opposite electric poles and also tending to press the joint edges together while directly bearing, respectively, upon the I opposite edge portions of the butt-joint of a tube, all without bearing upon such joint; two other rolls located, respectively, on opposite sides of'said cond noting-rolls and tending to force the joint edges together by compression of the tube along lines of pressure angular to those of said conducting-rolls and also tending to feed the tube forward; a

joint-guide located in the line of movement of the tube before said conducting-rolls and in a plane passing centrally through the clear space between the latter and adapted by-engagement with the joint edges to insure each of the edge portions being in contact with only its appropriate one of the two conducting-rolls and being properly in contact with such one; draft means tending to pass the tube between said compression-rolls, said conducting and compression rolls being relatively located so that a plane right angular to the line of movement of the tube may pass through them all, the axial'plane of the conductingrolls across the line of movement of the tube being before the axial plane of the compression-rolls across such line, the construction and insulation of such members excluding the passage of the electric current otherwise than by said conducting-rolls, each of said conducting-rolls having contact with only its appropriate one of the two edge portions of the butt-joint, such edge portions transmitting the currentacross said joint.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as re gards the mechanism herein disclosed, provided the means covered by any one of the following claims be employed.

I therefore particularly point out and distinctly claim as my invention- 1. In a tubewelding machine, the combination of two electric-current-conducting de-, vices respectively connected with opposite electric poles and adapted to directly press respectively on the opposite edge portions of the butt-joint of a tube, and two rolls tending to force said butt edges together bycompression of the tube along lines of .pressure angular to those of said conducting devices, substantially as set forth.

2. In a tube-welding machine, the combination of two electric-current-conducting devices respectively connected'with opposite electric poles and adapted to have contact respectively with the opposite edge portions of the butt-joint of a tube while free from contact with such joint, and two-rolls located respectively on opposite sides of'saidconducting devices and tending to force said butt edges together, substantially as set forth.

3. In atube-welding machine, the combination of two electric-current-conducting devices respectively connected with opposite electric poles and adapted to have contact respectively with the opposite edge portions of the butt-joint of a tube, and two roll's adapted to compress such tube between them and thereby force said joint edges together, such conducting devices and rolls relatively 10- cated so that a plane right angular to the line two rolls tending to force together said edges i l t t l S l i 2 i i E i i 1 i i by compression of the tube between them along lines of pressure angular to those of said conducting-rolls, substantially as set forth.-

5. In a tube-welding machine, the combination of two electric-current-conducting rolls respectively connected with opposite electric poles and adapted to press respectively on the opposite edge portions of the butt-joint of atube, while free from contact with such joint, and two other rolls located respectively on opposite sides of said conducting-rolls and adapted to compress the tube between them, such four rolls being relatively located so that a plane right angular to the line of movement of the tube may pass through them all, substantially as set forth.

6. In a tube-welding machine, the combination of two electric-current-conducting rolls respectively connected with opposite electric poles and tending to press together the opposite edges of the butt-joint of a tube by direct-ly bearing respectively upon such two edge portions while free from bearing upon such joint, and two other rolls located respectively on opposite sides of said conductingrolls and tending to force said edges together by compression of the tube between them along lines of pressure angular to those of said conducting-rolls, such four rolls being located so that a plane right angular to the line of movement of the tube may pass through them all; the construction and insulation of said members excluding passage of said electric current otherwise than by said conducting-rolls, each of which latter has contact with only its appropriate one of said two edge portions, and by such edge portions transmitting said current across said joint, substantially as set forth.

7. In a tube-welding machine, the combination of two electric-current-conducting rolls respectively connected with opposite electric poles and adapted to bear respectively upon opposite edge port-ions of the butt-joint of a tube, but not upon such joint, and two other rolls electricallydisconnected from said conducting-rolls and adapted to partially inclose the tube respectively to opposite sides of said conducting-rolls at points farther from the butt-joint than are said conducting-rolls, and adapted to exert feeding force as well as compressing force upon the tube, substantially as set forth. a

8. In a tube-weldin g machine, the combination of two electric-current-conducting rolls respectively connected with opposite electric poles and adapted to have contact respectively with, the opposite edge portions of the buttjoint of a tube, and two rolls adapted to compresssuch tube between them, the axial plane of said conducting-rolls across the line of movement of the tube being before the axial plane of said compression-rolls across such line, substantially as set forth.

9. In a tube-welding machine, the combina- ;tion of two electric-current?conducting rolls respectively connected with opposite electric poles and adapted to have contact respec tively with the opposite edge portions of the butt-joint of a tube, and two rolls adapted to compress such tube between them, the axial plane of said conducting-rolls across the line of movement of the tube being before the axial plane of said compression-rolls across such line, such four rolls being located so that a plane right angular to the line of movement of the tube may pass through them all, substantially as set forth.

10. In atube-welding machine, the combination of two electric-current-conducting devices having a clear space between each other and respectively connected with oppo site electric poles and adapted to have contact. respectively with the opposite edge portions of the butt-joint of a tube, and two rolls located respectively on opposite sides of said conducting devices and adapted to compress the tube between them, together with a j ointguide located in a plane passing through said clear space between said conducting devices and adapted by engagement with the joint edges to cause each of such edge portions to have contact with only its appropriate one of said conducting devices, substantially as set forth.

11. Ina tube-welding machine, the combination of two electric current conducting devices having a clear space between each other and respectively connected with. oppu-. site electric poles and adapted to have contact respectively with the opposite edge ermits guide located be or sag con uc ing ey ges in a ane'passingcentralyl through said clear space between them andfada ted IT enme- M? mentwith the olnt e gas 0 cags e t 1e 1010i 6 m intameuianreplrgsiuofieiauvel to said conducting devicesfs'iidmy as set forth.

12. In a tube-welding machine, the combination of two electric current conducting devices respectively connected withopposite electric poles and adapted to have contact respectively with the opposite edge portions of the butt-joint of a tube, two rolls located respectively on opposite sides of said conduct ing devices and adapted to compress the tube between them, and draft means tending to pass the tube between said compression-rolls, substantially as set forth.

13. In a tube-welding machine, the combination of two electric-current-conducting rolls having a clear space between each other and respectively connected with opposite electric poles and adapted to press respectively on the opposite edge portions of the butt-joint of a tube, two rollslocated respectively on opposite sides of said conductingrolls and adapted to compress the tube between them, a joint-guide located before said conducting rolls and in a plane passing cenof the butt-joint of a tube, and twolollsld trally through said clear space between them? I of said electric current Otherwise than by said and adapted to engage with the joint edges,}

draft means tending to pass the tube between the compressionrolls, the axial plane of the conducting-rolls across-the line of movement of the tube being before the axial plane of the; compression-rolls across siieh line, said fourj rolls being located so that a plane right angu lar to the line of movement of the tube may pass through them all, the construction and insulation of saidmembers excluding passage conducting-rolls,each of which latter has contact with only its appropriate one of said edge portions, and by such edge portions transmitting said current across said joint, substantially as set forth.

' Signed b'yme this 17th day of January,1898.

' OTTO P'ARPART.

"THOS. B. HALL, Di. T. DAVIES 

